Last entry is at midnight, half an hour before closing at 00:30, so buy your bathing ticket in good time.
Uses natural hot spring water
Open-air outdoor bath
Enclosed indoor bathing area
Dry heat sauna room
Shared bathing area for all genders
Welcomes children and families
Restaurant or dining open to visitors (not just hotel meal plans)
Shower, wash stations, soap and shampoo provided
On-site or nearby parking available
200 spaces, free for up to 6.5 hours.
A simple thermal spring drawn from 800 m below Osaka's Taisho ward, emerging at 37.4 °C. It is weakly alkaline (pH 7.9), soft on the skin and gentle in character, sitting in Japan's beauty-water family. The posted indications cover nerve pain, muscle ache, joint pain, poor circulation and recovery from fatigue.
Sampled at wellhead
Jet Bath
Steam Sauna
Lukewarm BathKouwanoyu is a day-use bathhouse in Osaka's Taisho-ku, on an ordinary residential street away from downtown. The onsen water here isn't limited to the tubs: even the cold plunge and the wash-area taps run off the same pumped spring water. Outdoors there are three tubs at different heat levels, including a small tsubo-yu (壺湯) pot bath, and indoors a plain hot-water vibra bath called shirayu (白湯). The tower sauna lets off a burst of steam automatically on the hour, and a separate, gentler steam sauna sits alongside it; both are followed by a cold plunge filtered through bincho-charcoal (備長炭). There's also a jet-massage bath and an attached izakaya-style restaurant. It draws a steady crowd of neighborhood regulars, especially on weekday mornings, and the main bath is shallow enough for kids to join in.
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317. Kouwanoyu, Osaka Super sento with natural hot spring water, 30 minutes from Osaka station for 800. Operating hours listed as 10:00-00:30. They stamp the 41 Kansai Super Sento stamp rally 24/25. Has a restaurant, massage, massage chairs, and barber shop. Cool diagram showing the water source at the entrance. 1. Outdoor area. 1.1. Bath with clear water, temperature around 42. 1.2. Bath with clear water, temperature around 38-39. 1.3. Two barrel baths. 2. Indoor area. 2.1. Bath with light green water, temperature around 40. 2.2. Nine different jet baths, temperature around 40. 2.3. Sauna. 2.4. Steam bath. 2.5. Cold bath. A fairly average place — nothing particularly hooked me, but nothing negative to say either.
Last updated August 5, 2026